1)
What is the meaning of "Acharei ha'Bakar"?
1.
Rashi: It is after the time that the cattle come from the field.
2.
Radak: Sha'ul had returned home, and engaged in matters of his house, with the farmers.
3.
Malbim: It occurred that cattle of the city residents were going in front of him. This is why he decided to break the cattle (verse 7).